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Wetlands have many functions that are beneficial. This module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion.4  wetlands provide food and habitat.5  wetlands save people money.his module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion. 4  wetlands provide food and habitat.
Can this really work? We know that natural wetlands are excellent filters, removing pollutants and nutrients as water flows through them toward lakes, rivers, and oceans. Scientists and engineers have sought to replicate many of these natural processes in engineered wetlands.